__author__ = 'lenovo'
#coding=utf-8

import pygame.font
from pygame.sprite import Group
from ch02.shipgame.ship import Ship

class Scoreboard():
    """ 显示得分信息的类"""
    def __init__(self,ai_settings,screen,stats):
        """ 初始化显示得分涉及的属性
        :param ai_settings:
        :param screen:
        :param stats:
        :return:
        """
        self.screen = screen
        self.screen_rect = screen.get_rect()
        self.ai_settings = ai_settings
        self.stats = stats

        #显示得分信息时使用的字体设置
        self.text_color = (30,30,30)
        self.font = pygame.font.SysFont(None,48)

        #准备初始得分图像
        self.prep_score()
        #准备最高得分图像
        self.prep_high_score()
        self.prep_level()
        self.prep_ships()

    def prep_ships(self):
        """
        显示还余下多少飞船
        :return:
        """
        self.ships = Group()
        for ship_number in range(self.stats.ships_left):
            ship = Ship(self.ai_settings,self.screen)
            ship.rect.x = 10+ship_number*ship.rect.width
            ship.rect.y = 10
            self.ships.add(ship)

    def prep_level(self):
        """
        将等级转换为渲染的图像
        :return:
        """
        self.level_image = self.font.render(str(self.stats.level),True,self.text_color,self.ai_settings.bg_color)
        #将等级放在得分下方
        self.level_rect = self.level_image.get_rect()
        self.level_rect.right = self.score_rect.right
        self.level_rect.top = self.score_rect.bottom +10

    def prep_high_score(self):
        """将最高得分转化为渲染的图像"""
        high_score = int(round(self.stats.high_score,-1))
        high_score_str = "{:,}".format(high_score)
        self.high_score_image = self.font.render(high_score_str,True,self.text_color,self.ai_settings.bg_color)
        #将最高得分放在屏幕顶部中央
        self.high_score_rect = self.high_score_image.get_rect()
        self.high_score_rect.centerx = self.screen_rect.centerx
        self.high_score_rect.top = self.score_rect.top

    def prep_score(self):
        """ 将得分转换为一幅渲染的图像
        :return:
        """
        #round( x [, n]  ) 一般四舍五入，保留小数点后面n位， 负数将圆整到最近的10,100,1000等整数倍
        rounded_score = int(round(self.stats.score,-1))
        #以逗号分隔  http://www.runoob.com/python/att-string-format.html
        score_str = "{:,}".format(rounded_score)
        self.score_image = self.font.render(score_str,True,self.text_color,self.ai_settings.bg_color)
        #将得分放在屏幕右上角
        self.score_rect = self.score_image.get_rect()
        self.score_rect.right = self.screen_rect.right-20
        self.score_rect.top = 20

    def show_score(self):
        """ 在屏幕上显示得分和最高得分
        :return:
        """
        self.screen.blit(self.score_image,self.score_rect)
        self.screen.blit(self.high_score_image,self.high_score_rect)
        self.screen.blit(self.level_image,self.level_rect)
        #绘制飞船
        self.ships.draw(self.screen)